TS-480HX/480SAT
14
RF Unit (X44-327X-XX)
Ref No.
Use / Function
Operation / Condition / Compatibility
Q1 Switching ATT changeover relay control
(OFF when ATT is ON)
Q2 Switching Receiving RATB power supply control
(ON during reception)
Q3 Amplifier Transmission drive output amplifier
Q4 Mute Mutes reception path during transmis-
sion (ON during transmission)
Q51~60 Switching BPF selection
Q151 Switching ON when preamplifier is ON.
Q152 Switching ON when preamplifier is OFF.
Q153,154
Amplifier Preamplifier
Q155 Switching
Gain changeover switch for preamplifier.
ON when receiving over 21.5MHz
Q156,157
Mixer Receiving first mixer
Q158 Switching Preamplifier power supply control (ON
when preamplifier is ON.)
Q159 Amplifier RX LO1 amplifier
Q160,161
Mixer Receiving first mixer
Q251 Switching Transmission IF mute control
(Mute when ON.)
Q252 Amplifier Transmission IF amplifier
Q253 Amplifier Receiving IF amplifier
Q255 Amplifier LO2 amplifier
Q256 Switching Gain correction between bands.
ON when receiving over 21.5MHz
Q301 Switching KYS signal control (ON when KEY is
inserted.)
Q302
RX power supply
control switch
IC251 Mixer Transmission mixer
IC301 Shift register Q0:
Hi when BPF of 7M band is selected.
Q1:
Hi when BPF of 10M band is selected.
Q2:
Hi when BPF of 14M band is selected.
Q3:
Hi when BPF of 3.5M band is selected.
Q4:
Hi when BPF of BC band is selected.
Q5:
Hi when BPF of 21M band is selected.
Q6:
Hi when BPF of 50M band is selected.
Q7:
Hi when BPF of 30~60M band is selected.
Q8:
Hi when BPF of 28M band is selected.
Q9:
Hi when BPF of 1.8M band is selected.
Ref No.
Use / Function
Operation / Condition / Compatibility
Q10: Hi when ATT is ON
.
Q11: Hi when preamplifier is ON.
D1
Surge absorption
For ATT changeover relay
D2~5 Limter
D51 Switching ON when receiving over 1.705MHz is
selected.
D52 Switching ON when receiving under 1.705MHz
is selected.
D53 Switching ON during transmission
D54 Switching ON when receiving over 1.705MHz is
selected.
D55 Switching ON when BPF of 1.705~2.5MHz is
selected.
D56 Switching 1/2: ON when BPF of 2.5~4.1MHz is
selected.
2/2: ON when BPF of 14.5~21.5MHz
is selected.
D57 Switching 1/2: ON when BPF of 7.5~10.5MHz is
selected.
2/2: ON when BPF of 30~49MHz and
54~60MHz are selected.
D58 Switching 1/2: ON when BPF of 4.1~7.5MHz is
selected.
2/2: ON when BPF of 21.5~30MHz is
selected.
D59 Switching 1/2: ON when BPF of 10.5~14.5MHz
is selected.
2/2: ON when BPF of 49~54 MHz is
selected.
D60 Switching ON when receiving under 1.705MHz is
selected.
D61 Switching
ON when BPF of 2.5~4.1MHz is selected.
D62 Switching
ON when BPF of 4.1~7.5MHz is selected.
D63 Switching
ON when BPF of 7.5~10.5MHz is selected.
D64 Switching
ON when BPF of 10.5~14.5MHz is selected.
D65 Switching
ON when BPF of 14.5~21.5MHz is selected.
D66 Switching
ON when BPF of 21.5~30MHz is selected.
D67 Switching ON when BPF of 30~49MHz and
54~60MHz are selected.
D68 Switching
ON when BPF of 49~54MHz is selected.
D69 Switching
ON when BPF of 1.705~2.5MHz is selected.
COMPONENTS DESCRIPTION
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